The statistics of ferroelectrics of the KDP family is investigated on the basis of Blinc and Svetina's model. Tables and graphes for various thermodynamic quantities connected with the transition are presented which permit a comparison with the experiment and an estimation of parameters of the theory for any crystal of the family. An attempt of such a fit of parameters is made and gives a satisfactory description of all the experimental data except the differences between the Curie and Curie‐Weiss temperatures which are too small in the theory. Some trends in variations of the found parameters with composition are observed and discussed.

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We present an approach for self-consistent calculations of the many-body Green function in transition metals. The distinguishing feature of our approach is the use of one-site approximation and the self-consistent quasiparticle wave function basis set obtained from the solution of the Schrödinger equation with a nonlocal potential. We analyze several sets of skeleton diagrams as generating functionals for the Green function self-energy, including GW and fluctuating exchange sets. Calculations for Fe and Ni revealed stronger energy dependence of the effective interaction and self-energy of the d electrons near the Fermi level compared to s and p electron states.

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